Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0d1b4c356756c6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-08 18:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 343a4a123b724195d97f60c7c33c55b6 SHA-1: bab8a56b546456988d3c2991c826219f18b12584 SHA-256: 0b0d1b4c356756c68a1f1991b7656f68dcadc009522f935b4f0a26f501f3a8eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF hosts numerous links on distinct, disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/2546335405.pdf In PDF document text
    • http://topbuild.net/content/xuploadimages/file/dogasegeb.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/63467062985.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/rebivalufuzekodo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tezub.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wupufa.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/gisokomub.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/95944566501.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kuxuwelikunikugitib.pdfIn PDF document text
    • https://limsurempat.com/contents/files/28228441588.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xuzivivufegepefofoxenatig.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvirexuvukaje.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/gurunuzifonegikixedudifeg.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/32393618726.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/vonutanifuwat.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/99491404731.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7788232ab608efed79d3c664ae86b590/5252493037.pdfIn PDF document text
    • http://soupworld.de/upload/file/mefizenulelam.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/deberuvosujanurivi.pdfIn PDF document text
    • http://candientushinko.com/images/file/mutimebuzuvavi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/66941207400.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163079002832564732609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=english+book+class+4+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 10864 bytes
SHA-256: 639305aceae1d8e3ebf6dbf701a38414677baee1c469d3e337c663cbdd8de6ca
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16932 bytes
SHA-256: b559e850c2132b42b3cf9aacc07a21c2bf4b833150f172747f5c1f93019f32f9

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